emilk/egui · error

Nonexistent font ID

Error message

Nonexistent font ID

What it means

Error "Nonexistent font ID" thrown in emilk/egui.

Source

Thrown at crates/epaint/src/text/font.rs:682

pub struct Font<'a> {
    pub(super) fonts_by_id: &'a mut nohash_hasher::IntMap<FontFaceKey, FontFace>,
    pub(super) cached_family: &'a mut CachedFamily,
    pub(super) atlas: &'a mut TextureAtlas,
}

impl Font<'_> {
    pub fn preload_characters(&mut self, s: &str) {
        for c in s.chars() {
            self.resolve_face(c);
        }
    }

    /// All supported characters, and in which font they are available in.
    pub fn characters(&mut self) -> &BTreeMap<char, Vec<String>> {
        self.cached_family.characters.get_or_insert_with(|| {
            let mut characters: BTreeMap<char, Vec<String>> = Default::default();
            for font_id in &self.cached_family.fonts {
                let font = self.fonts_by_id.get(font_id).expect("Nonexistent font ID");
                for chr in font.characters() {
                    characters.entry(chr).or_default().push(font.name.clone());
                }
            }
            characters
        })
    }

    pub fn styled_metrics(
        &self,
        pixels_per_point: f32,
        font_size: f32,
        coords: &VariationCoords,
    ) -> StyledMetrics {
        self.cached_family
            .fonts
            .first()
            .and_then(|key| self.fonts_by_id.get(key))

View on GitHub (pinned to d802a982ce)

When it happens

Trigger: Thrown at crates/epaint/src/text/font.rs:682 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emilk/egui@d802a982ce (2026-08-16). Data as JSON: /api/errors/c2131f8924603753. Report an issue: GitHub.